Research is ___to make the process cheaper.
going on
keeping on
carrying on
passing on
why?
人气:373 ℃ 时间:2020-06-04 13:12:47
解答
go on,keep on,pass on,carry on后面都可以接现在分词doing,
只有go on后面可以接不定式to do,
所以选going on.
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